The methylotrophic yeast Pichia pastoris is widely used in the manufacture of industrial enzymes and pharmaceuticals. Like most biotechnological production hosts, P. pastoris is heterotrophic and grows on organic feedstocks that have competing uses in the production of food and animal feed. In a step toward more sustainable industrial processes, we describe the conversion of P. pastoris into an autotroph that grows on CO2. By addition of eight heterologous genes and deletion of three native genes, we engineer the peroxisomal methanol-assimilation pathway of P. pastoris into a CO2-fixation pathway resembling the Calvin–Benson–Bassham cycle, the predominant natural CO2-fixation pathway. The resulting strain can grow continuously with CO2 as a sole carbon source at a µmax of 0.008 h−1. The specific growth rate was further improved to 0.018 h−1 by adaptive laboratory evolution. This engineered P. pastoris strain may promote sustainability by sequestering the greenhouse gas CO2, and by avoiding consumption of an organic feedstock with alternative uses in food production.
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The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request. Genome sequencing reads of mutant strains are available at NCBI BioProject PRJNA586834. Sequences of codon-optimized genes are shown in the Supplementary Information. The accession numbers and locus tags of all native and heterologous sequences are shown in Supplementary Table 7 and Supplementary Table 8. Materials will be made available for non-profit research under a material-transfer agreement upon reasonable request to the corresponding author.
Mass-spectrometry data were collected using Agilent Technologies MassHunter GCMS Acquisition Software B.07.06 SR1 combined with a post-acquisition application (Agilent SureMass). Theoretical masses were extracted from the SureMass-converted data and analyzed using the Agilent Technologies MassHunter Workstation Quantitative Analysis for TOF Build 10.0.707.0 and the Isotope Correction Toolbox v.0.04. Genome sequence analysis including calling of single-nucleotide polymorphisms was carried out using CLC Genomic Workbench 12.0 (QIAGEN). Microscopy pictures were processed using Zen 2.3 lite (blue edition) software (Carl Zeiss Microscopy). Flow cytometry data were analyzed using CytExpert (v.18.104.22.168) (Beckman Coulter). No custom code was used in this study.
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This work has been supported by the Federal Ministry for Digital and Economic Affairs, the Federal Ministry for Transport, Innovation and Technology, the Styrian Business Promotion Agency SFG, the Standortagentur Tirol, the Government of Lower Austria and ZIT - Technology Agency of the City of Vienna through the COMET Funding Program managed by the Austrian Research Promotion Agency FFG (grant to D.M. and M.G.S.). We also thank the Austrian Science Fund for support to D.M. and T.G. (FWF W1224, Doctoral Program on Biomolecular Technology of Proteins (BioToP)). The funding agencies had no influence on the conduct of this research. EQ BOKU VIBT is acknowledged for providing fermentation and mass-spectrometry equipment. We kindly acknowledge technical support from S. Heinzl and P. Tondl. We also kindly thank H. Rußmayer for help during labeling experiments.
D.M., T.G., M.G.S., M.S. and B.G. are inventors of a patent application (application number PCT/EP2018/064158) that is based on the results reported in this publication.
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(a) Wild type P. pastoris is able to use methanol (MeOH) for biomass in the assimilatory branch of the MeOH utilization by fixation of formaldehyde (FA) to xylulose-5-phosphate (Xu5P) which is regenerated in the xylulose monophosphate (XuMP) cycle (purple pathway) and as an energy source in the dissimilatory branch (pink pathway) by oxidation to carbon dioxide (CO2) under formation of NADH. (b) In an engineered strain MeOH assimilation is blocked by deletion of dihydroxyacetone synthase (DAS1 and DAS2) and a CO2 fixation pathway similar to a Calvin-Benson-Bassham (CBB) cycle is integrated (integration of RuBisCO, PRK, TDH3, PGK1, TKL1, TPI1, groEL and groES). RuBisCO carboxylates ribulose-1,5-bisphosphate which is regenerated in the synthetic CBB cycle; Additionally, the alcohol oxidase 1 gene AOX1 was deleted to avoid accumulation of formaldehyde. The enzymatic steps shown in magenta are present in both pathways (a and b). Abbreviations: alcohol oxidase (Aox), dihydroxyacetone synthase (Das), fructose-1,6-bisphosphate aldolase (Fba1-2), fructose-1,6-bisphosphatase (Fbp1), sedoheptulose-1,7-bisphosphatase (Shb17), ribose-5-phosphate ketol-isomerase (Rki1-2), D-ribulose-5-phosphate 3-epimerase (Rpe1-2), formaldehyde dehydrogenase (Fld1), S-formylglutathione hydrolase (Fgh1), formate dehydrogenase (Fdh1), ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO), dihydroxyacetone (DHA), glyceraldehyde-3-phosphate (GAP), 3-phosphoglycerate (3PGA), glutathione (GSH), ribose-5-phosphate (R5P), ribulose-1,5-bisphosphate (RuBP).
CBBp+RuBisCO (black line) and CBBp+RuBisCO (purple line) were cultivated under chemoorganoautotrophic conditions and the mean of at least three biological replicates (independent transformations) with single values (black and purple signs) is shown.
Supplementary Figure 3 Transketolase 1 (Tkl1) does not substitute for dihydroxyacetone synthase (Das1/2).
Cells were cultivated in 3 g L-1 glycerol containing minimal medium and then fed with methanol (MeOH) shots as indicated (first shot was for induction while glycerol was still present). Strains: Δaox1 (red dashed line), Δaox1,Δdas1: Δaox1::TDH3p,PGK1p and Δdas1 (yellow line), Δaox1,Δdas1,Δdas2::TKL1p: Δaox1::TDH3p,PGK1p, Δdas1 and Δdas2::TKL1p (dark blue line), Δaox1,Δdas1,Δdas2: Δaox1::TDH3p,PGK1p, Δdas1 and Δdas2 (blue line) and CBBΔRuBisCO: Δaox1::TDH3p,PRKp,PGK1p, Δdas1 and Δdas2::TPI1p,TKL1p, Each clone was cultivated in duplicates (error bars indicate s.e.m.) and the Δaox1 control was cultivated as triplicate (error bars show s.d. of three independent cultivations, n=3).
(a) Engineered CBBp+RuBisCO (a and b) are able to grow in presence of methanol and CO2 while CBBpΔRuBisCO are not. CBS7435 wt cells grow well in presence of both substrates, since methanol can be utilized for biomass and energy generation. Cells were cultivated in batch phase (16.0 g L-1 glycerol) until 10 g L-1 cell dry weight (CDW) and then fed with 0.5 – 1.0% (v/v) methanol pulses and a constant inflow of 5% CO2. CDW values are calculated from OD measurements (correlation: 1 OD600 unit = 0.191 g L-1 CDW) and standard error bars indicate s.e.m.; (b) Methanol consumption. Methanol uptake rates were determined during cultivation (time frame of 24 h indicated by arrows in (a) and showed the highest methanol utilization by CBS7435 wt cells followed by the engineered CBBp+RuBisCO (a and b – experiment repeated twice). The strain lacking RuBisCO (CBBpΔRuBisCO) showed slow methanol utilization.
Supplementary Figure 5 Labeling of engineered P. pastoris cells shows complete biomass formation from 12C carbon dioxide.
(a–c) Bioreactor cultivation of 13C labelled biomass from two CBBp+RuBisCO clones (a, b – individual transformations) and the reinoculated biomass from one clone (c) with 12CO2 as a carbon source. The 13C biomass content of the inoculum was enriched by cultivation on fully labelled 13C glycerol. During cultivation, cells were fed with 5 % 12CO2 and methanol. (d–f) Logarithmic CDW value indicates the specific growth rate for the strains in all three reactors. (g, h) Mean cell size (error bars show cell size s.d. of yeast population – 50000 events recorded) and cell viability (error bars indicate s.e.m.) during the cultivation of CBBp+RuBisCO a and b. (i) Characteristic bright field image from day 1 (upper panel) and day 21 (lower panel) of cultivation (bar = 10µm). (k, l) 13C content of the biomass measured by EA-IRMS for CBBp+RuBisCO a and CBBp+RuBisCO b (k) and its reinoculation (l) empty bars indicate calculated values and full bars show measured values ± s.e.m.
Cultivation of strains after ALE in serial batch cultivations for 27 to 29 generations; Cell Dry Weight (CDW) values are calculated from OD600 measurements (correlation: 1 OD600 unit = 0.191 g L-1 CDW, error bars indicate s.e.m.), (a) The pools (full lines) from evolved cells were compared for growth on CO2 and methanol to each parental strain cultivated under the same conditions (dashed lines); (b) from one Pool (CBBp+RuBisCO b) 12 single colonies were further characterized under the same conditions showing better growth for 3 single colonies derived from the evolved population. This experiment was repeated twice with similar results.
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Gassler, T., Sauer, M., Gasser, B. et al. The industrial yeast Pichia pastoris is converted from a heterotroph into an autotroph capable of growth on CO2. Nat Biotechnol 38, 210–216 (2020). https://doi.org/10.1038/s41587-019-0363-0
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